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-21=v/18
We move all terms to the left:
-21-(v/18)=0
We add all the numbers together, and all the variables
-(+v/18)-21=0
We get rid of parentheses
-v/18-21=0
We multiply all the terms by the denominator
-v-21*18=0
We add all the numbers together, and all the variables
-1v-378=0
We move all terms containing v to the left, all other terms to the right
-v=378
v=378/-1
v=-378
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